Am 02.07.2010 15:34, schrieb
The reason may be documented in /usr/share/doc/ffmpeg/README.Debian.gz
but it is very hard to tell.

I fail to see what is difficult to understand in this sentence from README.Debian: "I did not activate MP3 encoding (through LAME) in libavcodec [...]"

However, I agree that the error message

Encoder (codec id 86017) not found for output stream #0.0

should be improved to at least call the encoder by name.

OK, probably the message should be **codec disabled for legal reasons by Debian.
Try putting debian-multimedia... on top of your /etc/apt/sources.list... and
do apt-get update, then reinstall their version of this package**"

We have very good reasons to never ever recommend using packages from this repository. Furthermore, the MP3 encoder has never been actively *disabled* in Debian. ffmpeg is simply not built against LAME, because this is not available in Debian at all.

P.S., does this really turn 8 kb/s into 64 kb/s? Is that a good thing to do?

Well I tried -ab 8k and found out that the Stream #0.1: Audio: mp3, 22050 Hz, 2 
channels, s16, 8 kb/s
must be wrong. ffprobe gives the same wrong answer.

This is a completely different issue and should get its own bug report.

P.S.S., the man page,

        -ac channels
            Set the number of audio channels (default = 1).

is wrong. As you see above two channels were the output, even without
this option.

If it just extracts the mp3 then it should say so in several of the
affected places on the man page.


 - Fabian

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